﻿
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;


namespace ZoomImageDemo
{
    public class CutPhotoHelp
    {
        public static string SaveCutPic(string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY, int imageWidth, int imageHeight)
        {
             using (Image originalImg = Image.FromFile(pPath))
             {
                 if (originalImg.Width == imageWidth && originalImg.Height == imageHeight)
                 {
                     return SaveCutPic(pPath, pSavedPath, pPartStartPointX, pPartStartPointY, pPartWidth, pPartHeight,
                             pOrigStartPointX, pOrigStartPointY);
                      
                 }
                 string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
                 string filePath = pSavedPath + "\\" + filename;

                 Bitmap thumimg =MakeThumbnail(originalImg, imageWidth, imageHeight);
               
                 Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);

                 Graphics graphics = Graphics.FromImage(partImg);
                 Rectangle destRect = new Rectangle(new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight));//目标位置
                 Rectangle origRect = new Rectangle(new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight));//原图位置（默认从原图中截取的图片大小等于目标图片的大小）

                 ///文字水印  
                 Graphics G = Graphics.FromImage(partImg);
                 //Font f = new Font("Lucida Grande", 6);
                 //Brush b = new SolidBrush(Color.Gray);
                 G.Clear(Color.White);
                 // 指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。 
                 G.InterpolationMode = InterpolationMode.HighQualityBicubic; 
                // 指定高质量、低速度呈现。 
                 G.SmoothingMode = SmoothingMode.HighQuality;

                 graphics.DrawImage(thumimg, destRect, origRect, GraphicsUnit.Pixel);
                 //G.DrawString("Xuanye", f, b, 0, 0);
                 G.Dispose();

                 originalImg.Dispose();
                 if (File.Exists(filePath))
                 {
                     File.SetAttributes(filePath, FileAttributes.Normal);
                     File.Delete(filePath);
                 }
                 partImg.Save(filePath, ImageFormat.Jpeg);

                 partImg.Dispose();
                 thumimg.Dispose();
                 return filename;
             }
        }

        public static Bitmap MakeThumbnail(Image fromImg, int width, int height)
        {
            Bitmap bmp = new Bitmap(width, height);
            int ow = fromImg.Width;
            int oh = fromImg.Height; 

            //新建一个画板
            Graphics g = Graphics.FromImage(bmp);
         
            //设置高质量插值法
            g.InterpolationMode = InterpolationMode.High;
            //设置高质量,低速度呈现平滑程度
            g.SmoothingMode =SmoothingMode.HighQuality;
            //清空画布并以透明背景色填充
            g.Clear(Color.Transparent);

            g.DrawImage(fromImg, new Rectangle(0, 0, width, height),
                new Rectangle(0, 0, ow, oh),
                GraphicsUnit.Pixel);

            return bmp;

       }

        public static string SaveCutPic(string pPath, string pSavedPath, int pPartStartPointX, int pPartStartPointY, int pPartWidth, int pPartHeight, int pOrigStartPointX, int pOrigStartPointY)
        {
           string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
           string filePath = pSavedPath + "\\" + filename;

            using (Image originalImg = Image.FromFile(pPath))
            {
                Bitmap partImg = new Bitmap(pPartWidth, pPartHeight);
                Graphics graphics = Graphics.FromImage(partImg);
                Rectangle destRect = new Rectangle(new Point(pPartStartPointX, pPartStartPointY), new Size(pPartWidth, pPartHeight));//目标位置
                Rectangle origRect = new Rectangle(new Point(pOrigStartPointX, pOrigStartPointY), new Size(pPartWidth, pPartHeight));//原图位置（默认从原图中截取的图片大小等于目标图片的大小）
                
                ///注释 文字水印  
                Graphics G = Graphics.FromImage(partImg);
                //Font f = new Font("Lucida Grande", 6);
                //Brush b = new SolidBrush(Color.Gray);
                G.Clear(Color.White);
                // 指定高质量的双三次插值法。执行预筛选以确保高质量的收缩。此模式可产生质量最高的转换图像。 
                G.InterpolationMode = InterpolationMode.HighQualityBicubic;
                // 指定高质量、低速度呈现。 
                G.SmoothingMode = SmoothingMode.HighQuality; 

                graphics.DrawImage(originalImg, destRect, origRect, GraphicsUnit.Pixel);
                //G.DrawString("Xuanye", f, b, 0, 0);
                G.Dispose();

                originalImg.Dispose();
                if (File.Exists(filePath))
                {
                    File.SetAttributes(filePath, FileAttributes.Normal);
                    File.Delete(filePath);
                }
                partImg.Save(filePath, ImageFormat.Jpeg);
                partImg.Dispose();
            }
            return filename;
        }
       
    }

}
